C# “收到”；System.Runtime.InteropServices.ComeException“；在Windows应用程序中

在我的windows应用程序中，我试图将映像从本地计算机加载到服务器，但在语句

StorageFile=wait open.PickSingleFileAsync（）上遇到异常
System.Runtime.InteropServices.COMException
。方法如下：

FileOpenPicker open = new FileOpenPicker();
StorageFile file = await open.PickSingleFileAsync();
if (file != null)
{
    using (IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
    {
        // Set the image source to the selected bitmap 
        BitmapImage bitmapImage = new BitmapImage();
        bitmapImage.DecodePixelWidth = 600; //match the target Image.Width, not shown
        await bitmapImage.SetSourceAsync(fileStream);
        big_image.Source = bitmapImage;
    }
}

如何修复它？？？我用的是VS'13
Big_image
是在
xaml
中定义的图像，我正在尝试设置其源。
用于拾取图像。
用于拾取图像。
我通过添加一些新内容获得了解决方案：

FileOpenPicker openPicker = new FileOpenPicker();
openPicker.ViewMode = PickerViewMode.Thumbnail;
openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
openPicker.FileTypeFilter.Add(".jpg");
openPicker.FileTypeFilter.Add(".jpeg");
openPicker.FileTypeFilter.Add(".png");

StorageFile file = await openPicker.PickSingleFileAsync();
if (file != null)
   {
      using (IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
      {
           // Set the image source to the selected bitmap 
           BitmapImage bitmapImage = new BitmapImage();
           await bitmapImage.SetSourceAsync(fileStream);
           big_image.Source = bitmapImage;
      }
   }

我通过添加一些新内容得到了解决方案：

FileOpenPicker openPicker = new FileOpenPicker();
openPicker.ViewMode = PickerViewMode.Thumbnail;
openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
openPicker.FileTypeFilter.Add(".jpg");
openPicker.FileTypeFilter.Add(".jpeg");
openPicker.FileTypeFilter.Add(".png");

StorageFile file = await openPicker.PickSingleFileAsync();
if (file != null)
   {
      using (IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
      {
           // Set the image source to the selected bitmap 
           BitmapImage bitmapImage = new BitmapImage();
           await bitmapImage.SetSourceAsync(fileStream);
           big_image.Source = bitmapImage;
      }
   }